LAMSON-SCRIBNER AND MERRILL — GRASSES OF ALASKA. 59 



Panicles open, spreading; leaf blades flat. 



Spikelets 4 to 6 mm. long; glumes strongly scabrous. . 5. C. langsdorffii. 

 Spikelets 3 to 3.5 mm. long; glumes only slightly 



scabrous 6. C. canadensis. 



Panicles narrow, contracted, often almost spike-like; leaf 

 blades narrow, mostly involute. 

 Spikelets 3.5 mm. long or leas; whole plant soft in 



texture 8. C, neglecta. 



Spikelets 4 to 5 mm. long; plants mostly rigid. 



Spikelets 5 mm. long; glumes minutely scabrous- 

 pubescent 7. C. lapponica. 



Spikelets 4 to 4.5 mm. long; glumes glabrous ex- 

 cept on the scabrous keels 9. C. hyperborca. 



1. Calamagrostis deschampsioides Trin. Gram. Icon. 3: pi, 354- 1836. 



A slender, cespitose perennial, 15 to 30 cm. high, from creeping rootstocks, with 

 narrow leaves 3 to 7 cm. long and open pyramidal panicles 4 to 8 cm. long; spikelets 



4 mm. long, or in the subspecies 6 to 7 mm. long; glumes acute, about the length of the 

 awned lemma; awn stout, exceeding the lemma. 



Pribilof Islands to Cook Inlet and Prince William Sound; also in Kamchatka. 

 Specimens examined: St. Paul, Merriam in 1891, Macoun 16224; Prince William 

 Sound, near Orca, Coville & Kearney 1336a; Kasilof, Evans 683, 742. 



la. Calamagrostis deschampsioides macrantha Piper, subsp. nov. 



Spikelets 6 to 7 mm. long, otherwise as in the species. 



Type U. S. National Herbarium no. 592345 collected July 25, 1904, Kodiak, Alaska, 

 by C. V. Piper (no. 4688). 



2. Calamagrostis arctica Vasey, U. S. Dept. Agr. Div. Bot. Bull. 13: pi. 55. 1892. 

 A glabrous perennial, 20 cm. high or less, with short flat leaves and small purplish 



panicles 2 to 3 cm. long, barely 1 cm. in diameter; spikelets 4 to 5 mm. long; glumes 

 lanceolate, scabrous on the keels and minutely scabrid throughout; lemma 4 mm. long, 

 smooth; awn attached near the base, 6 to 7 mm. long, exserted; callus hairs about one- 

 fourth as long as the lemma. 



Pribilof and Shumagin Islands. 



Specimens examined: St. Paul Island, Macoun 38; Shumagin Islands, Popof, 

 Kincaid in 1899. 



This species is recognized by its small size, small panicles, spikelets smaller than in 

 Calamagrostis purpurascens, and by its perfectly glabrous leaves and sheaths. 



3. Calamagrostis purpurascens R. Br. in Richards. Bot. App. Frankl. Journ. 731. 



1823. 



Calamagrostis sylvatica A. Gray, Proc. Amer. Acad. 6: 80. 1868. 



Calamagrostis yukoncnsis Xash, Hull. X. Y. Hot. Gard. 2: 154. 1901. 



A rather rigid, densely cespitose, erect perennial 30 to 60 cm. high, with firm flat or 

 involute leaves scabrous beneath, densely short-pubescent above, and densely flowered, 

 purple, spike-like panicles 5 to 15 cm. long; spikelets 5 to 6 mm. long; glumes hispidu- 

 lous; lemma hispidulous, 4 to 5 mm. long, the geniculate awn attached near the base, 



5 to 8 mm. long, exserted, twisted below the geniculation. 



In dry rocky soils, arctic Alaska and the upper Yukon, eastward to Greenland and 

 southward in the mountains to Colorado and California. 



Specimens examined: Port Clarence, Walpole 1629; Yukon River, Funston in 1893; 

 Five Finger Rapids, Funston, Tarleton 84; Fort Yukon, McDonald in 1864; Eagle, 

 Georgeson '31 ; Chandlar (Gens de Large) and Koyukuk Rivers, Schrader in 1899; Daw- 

 son, Williams in 1899; without locality, McGrath in 1890. 



